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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'f1461b5955b3dd5cb883ecf168a067438810a3dfcc28daea8cd45e3c0ba600ca' 
  AND token = 'OVpXSf6nPmXMC4dVUOR8TD/SYMx00HBhmzDbTfd07RM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}